7mm mag light loads

So I have a new Borden rifle with nightforce scope. My son is 9 years old and wants to get his first deer. I need a light recoil load. I have 120 grain ballastic tips using lightest imr4350 load possible. Minimium powder charge. 1.5 MOA but that won't matter on a buck at 100 yards. I wanted any thoughts on lightest recoil load possible or am I there? Rifle had pad and muzzle break but he is a little shy when it comes to recoil and he wants to use this rifle so I thought we would give it a try. Any ideas on light loads?? Low powder charge and light bullet right?